Fide686
Member
Is there any real accuracy effect of buying a revolver with a "target crown", or having one machined on an existing bbl? Thanks for your input.
Target crown?
- Thread starter Fide686
- Start date
Possibly. A precision crown definitely affects accuracy, whether it is a "target crown" or a standard Crown. A sloppy off angle target crown is no better than run of the mill standard crown. A good standard crown is usually just as good as a target crown.
Not sure , but theoretically, there's supposed to something about an 11 deg target crown that directs muzzle blast gasses in such a way that minimizes bullet upset as it exits the bore. At least that's what I've been told. Whether that's true remains to be seen. It could be just marketing. You know, something manufactures put there to make it sound like their gun is something special vs. the competition.
The sole purpose of a crown on the muzzle is to keep the exit of the bore countersunk to avoid damage. In some rifles, a small nick in that area will hurt accuracy.
As for a revolver??? It is doubtful any of us possess the shooting ability to really notice any difference at all ,accuracy wise, between a dedicated target crown and the standard factory machining on the end of the barrel.
The sole purpose of a crown on the muzzle is to keep the exit of the bore countersunk to avoid damage. In some rifles, a small nick in that area will hurt accuracy.
As for a revolver??? It is doubtful any of us possess the shooting ability to really notice any difference at all ,accuracy wise, between a dedicated target crown and the standard factory machining on the end of the barrel.
Two questions:
Is the crown on your gun messed up?
Are you a bullseye shooter?
If the answers to either of these questions is yes, then look into getting a target crown. If your answers are no, then don't bother.
Is the crown on your gun messed up?
Are you a bullseye shooter?
If the answers to either of these questions is yes, then look into getting a target crown. If your answers are no, then don't bother.
As long as there's no burrs or worn rifling, you probably will never notice a difference recutting a crown on a handgun!
BTW, the usual 11 degree crown that's so popular originated from a misunderstanding of how gas exits the muzzle. Because, although the gas does seem to exit at roughly 11 degrees from the boreline axis, the crowns are cut at 11 degrees from perpendicular to the axis! (I.e., 79 degrees.) Pure hooey. A true "11 degree crown" would look more like a funnel. (Which I have seen on some Russian .22 biathlon rifles. ETA: and the IZH46 air pistols, IIRC.)
But it does provide a little protection, versus the old 90 degree cut. (As used by Winchester for many years on their well renowned Model 52s and bull barreled Model 70s.)
BTW, the usual 11 degree crown that's so popular originated from a misunderstanding of how gas exits the muzzle. Because, although the gas does seem to exit at roughly 11 degrees from the boreline axis, the crowns are cut at 11 degrees from perpendicular to the axis! (I.e., 79 degrees.) Pure hooey. A true "11 degree crown" would look more like a funnel. (Which I have seen on some Russian .22 biathlon rifles. ETA: and the IZH46 air pistols, IIRC.)
But it does provide a little protection, versus the old 90 degree cut. (As used by Winchester for many years on their well renowned Model 52s and bull barreled Model 70s.)
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I bought the crowning tool from Brownells. It's an easy job and I saw a big difference in accuracy after crowning. Make sure you use cutting oil and it's an easy job.
I've seen improvements on my 929, that cut my groups almost in half.
I've seen improvements on my 929, that cut my groups almost in half.
Dang, you're right! I keep forgetting some of the weird stuff coming out of the factory currently. Like 929s with a supposedly flat crown that ain't. Falls under "burrs" but isn't. More like extrusions or something.
Then there's the built in wear that some muzzles have, I guess from leaky seals on the ECM machine. Lands are OK but the grooves get eroded unevenly. "New tech" learning curve, I hope! I even had a "lump" on my "new" 25-15. Did a thread some time back and everything. (Onset of "oldtimers" or just third shift syndrome? Couldn't be that I'm just stupid....!!!!)
ETA: This thread:
http://smith-wessonforum.com/s-w-re...other-inspection-item-ecm-rifled-barrels.html
But in this case removing the big bump didn't affect accuracy particularly, so....
ETA end:
We've had a Brownell's tool for years, right handy for general work. Precision rifles still get done in a lathe.
BTW, Precision Shooting or The Accurate Rifle magazine once had an article describing the results of a study of non-perpendicular crowns. They discovered that accuracy wasn't affected until the crown was off square by over 7 degrees (IIRC) but POI did move as the angle increased. Have used that info a couple of times getting sights regulated for a couple of odd firearms.
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TAC
Member
I agree with most of the posts above. Here are some examples of the various crowns discussed:
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Morning Fide686
If you are shooting a standard production revolver at the
normal 15 to 25 meter ranges with factory ammo then
barrel crown with have little to no effect on accuracy.
On the other hand if you have a precision barrel & are shooting
out to long ranges with precise fitted cylinder holes, a precision
cut forcing cone, & precise bullet sizing then a precise barrel
crown might show some improvement.
To me (personally) a recessed target crown does have one
advantage & that is it allows crown protection if the muzzle
is bumped or contacts a hard surface during rough handling.
OP
Fide686
Member
Thanks. I appreciate all of your responses.
